Questions tagged [antenna]

A length of conductive material used to transmit or receive a radio signal.

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4
votes
1answer
36 views

How do I test if my DX5e antenna is still good?

I have a second hand DX5e tx that I haven't really used a ton yet, just on a little Blade Inductrix, within my house. However, the upper plastic end is broken off and the actual antenna seems pretty ...
4
votes
2answers
46 views

How does having bent antenna impact reception?

I have heard that when an antenna is bent, it can reduce the performance of the antenna and thus limit the range of a drone. This is mentioned in this video at 5:29. I am wondering why a bend in an ...
5
votes
1answer
88 views

FrSky receiver snap-on connection problem

The snap connector thingy (picture included) on the xm+ receiver (although it is the same with nearly every other receiver) I have stupidly disfigured, as well as the antenna end. Is it possible to ...
4
votes
1answer
46 views

Can I mount my RX and VTX antennae next to one another?

I've heard that it is bad practice to mount a 2.4 GHz RC receiver antenna next to a 5.8 GHz FPV VTX antenna because the transmitting antenna will negatively impact the receiving antenna's reception. ...
3
votes
1answer
37 views

In what direction should I orient the dipole antenna on my 2.4 GHz RC transmitter?

My RC transmitter has a movable antenna that allows me to change its orientation, like this one: In what direction should I point my 2.4 GHz RC transmitter antenna for best range and signal ...
2
votes
1answer
33 views

Does FPV transmitter antenna need to match the goggle receiver antenna?

So for a Fatshark, do I need to have both FPV transmitter and receiver antennas to be of the same brand and same specs? What about for a DJI goggle?
1
vote
1answer
59 views

Can I replace the 433MHz modules on my homemade remote controller with an NRF24 transreciever?

I built a simple 4 channel 433MHz transmitter and receiver because I can't afford a remote controller. The range is limited to 3 feet and NFR24 transreceivers have a longer range, so my question is: ...
5
votes
3answers
453 views

How to mount XM+ receiver antennas?

I like to use XM+ receivers on many drones as they seem to work well and are small/light. What is the best angle and position to mount the antennas of an XM+ receiver in order to get the best signal? ...
5
votes
2answers
897 views

What is a “mushroom antenna”?

In Can circularly and linearly polarized antennae be used together for FPV? I read about a "mushroom antenna". While I have very little experience with FPV drones I am generally experienced in radios ...
11
votes
2answers
371 views

Can circularly and linearly polarized antennae be used together for FPV?

I have a few spare antennae of mixed polarizations I'd like to be able to reuse for my FPV gear. Is there anything I need to know about incompatible configurations of mismatched polarizations ...
4
votes
2answers
63 views

What is the difference between a patch and helical antenna?

I have seen both patch and helical antenna when shopping for video receiver antennae. All I know is that they are both directional antennae. Do these types of antennae have any inherent performance ...
6
votes
3answers
68 views

What is antenna gain?

As I understand it, generally, a higher gain antenna will result in a longer range and better reception for FPV flying. What is antenna gain? What makes a low-gain patch antenna different that a high-...
7
votes
2answers
84 views

Calculating the range of an FPV drone

It's been a long time since I studied Electronics and Communications Engineering, but if I recall correctly, it should be possible to calculate an estimate for the range of an FPV drone given the ...
7
votes
1answer
65 views

How fragile are the SMA connectors used in FPV equipment?

I've heard that it is a terrible idea to install and remove SMA antennae from my goggles every time I need to pack it away after a flight session. I know that this is because the SMA connector is ...
13
votes
2answers
125 views

Why is it bad to power up a drone without an antenna on the VTX?

I've heard a few times now that if you power up your drone you have to make sure that you have an antenna on the VTX. Is that true? If so, what will happen if I power up my drone without an antenna on ...
9
votes
1answer
64 views

How much does mounting an antenna near a carbon fiber frame degrade signal reception?

By how much is signal reception degraded if I mount my RC receiver antenna next to the carbon fiber frame of my quadcopter? I've heard that it's a major sin to do this because there is some sort of ...
-3
votes
1answer
75 views

How important is the plastic coating around a coax? [closed]

I was swapping over my pigtails and part of the plastic coating around the coax came off. The coax is still firmly soldered to the SMA connector - is this salvageable with some heat shrink, or do I ...
3
votes
1answer
49 views

What are the exact specifications of a RushFPV SMA connector?

I am designing a mount for a RushFPV SMA connector and have not been able to find the technical details. I need: The diameter of the connector The distance between the mounting screw holes The ...
10
votes
1answer
53 views

Crossfire signal strength - comparing Immortal “L” vs “T”

Is there any detrimental effect on signal reception when mounting crossfire antennas in the Immortal "L" orientation compared to the traditional "T"?
13
votes
2answers
100 views

What is circular polarization in antennae?

I've seen references to left-hand (LHCP) and right-hand circular polarization (RHCP) with respect to antennae, especially in reference to mushroom antennae. What's the difference between the two ...
6
votes
2answers
71 views

What makes mushroom antennae so good at receiving and transmitting omnidirectionally?

I've seen many references saying that mushroom antennae (like the one shown below) are excellent at receiving and transmitting omnidirectionally. I have them on my drones' video transmitters and one ...
10
votes
2answers
65 views

Should Crossfire transmitter antenna orientation match receiver antenna orientation?

I've always heard that you should orient the antenna on the Crossfire transmitter vertically, with the ends pointing up and down. I've also heard that you should do the same with the receiver antenna (...